Abstract: An installation for generation of a refrigerated gas flow from a mass of refrigerating material in solid or liquid state, includes a closed vaporization chamber (4) containing a charge (7) of refrigerating material in liquid or solid state and capable of resisting pressure. An ejector (9) of the Venturi type ensures the drive of a much greater gaseous flow rate by a drive stream of gas under pressure. A conduit (12) connecting the closed vaporization chamber (4) to the ejector (9) to feed to this latter the gas from the chamber by vaporization or sublimation of the refrigerating material as a drive flow of gas under pressure. The outlet of the ejector (9) is connected to a sleeve (10) whose length extends through a refrigerating chamber. This sleeve has along its length outlet nozzles (11) to distribute the refrigerated gas flow throughout the volume of the refrigerated chamber and to ensure the agitation of the air in this latter by jets of gas from the nozzles.